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T: Fachverband Teilchenphysik

T 81: Myondetektoren 2

T 81.6: Vortrag

Mittwoch, 26. März 2014, 18:00–18:15, P12

Understanding avalanches in a Micromegas using Single-Electron Response * Simulation aspects — •Fabian Kuger¹, Rob Veenhof², Thomas Zerguerras³, Bernard Genolini³, Miktat Imré³, Michael Josselin³, Alain Maroni³, Thi Nguyen Trung³, Joel Pouthas³, Emmanuel Rindel³, Philippe Rosier³, Daisuke Suzuki³, Lucien Séminor³, Claude Théneau³, Thomas Trefzger¹, Raimund Ströhmer¹, and Özkan Sahin² — ¹Julius-Maximilians-Universität Würzburg (Germany), — ²Uludag University (Turkey) — ³CNRS/IN2P3-Université Paris-Sud (France)

Micro-pattern-gaseous detectors as e.g. Micromegas are a fast developing and increasingly used technology. Accordingly there is a growing interest in an enhanced understanding of the formation process of electron avalanches. Especially the variance in electron amplification is influencing the detector performances but is rarely measured and hardly understood.

Using a Single-Electron-Response (SER) setup the variance of the electron amplification process has become experimental accessible. The huge contribution on the total ionization by energy transfer from excited states on quencher molecules (penning effect) and the impact of secondary avalanches have been estimated using Townsend based model calculations. To compare experimental gain variances with the theory driven prediction, simulations have been designed and tuned, simulating avalanche formation on microscopic electron tracking level in Garfield++. This presentation is dedicated to the simulation part.